Knew I'd seen reference to this issue somewhere. It was in the Prog Ind EMS manual.
They say in an RV you should "never bond the neutral and ground together for any reason". Bonding in an RV "will create a ground fault condition and may result in electrical shock and or fire hazard"
Pretty explicit; the neutral and ground should remain isolated in an RV, unlike a house.
So separate from whether the Inverter can deal with it, Prog Ind EMS explicitly says no.
IMO you are mis-interpreting the statement in the manual. Considering how many years this "open ground" issue has been around I think it's pretty lame that Progressive Ind does not directly address it. Back to opinion, if you place the bond at the inverter or generator, you are not touching the RV's electrical system, which is what the warning is about. You are bonding at the power source. The RV's electrical system ends at the shore power plug. Say you have 2 inverters or generators, one that's permanently bonded and the other where you added the bond yourself? What's the difference from the EMS's point-of-view?
Not meant to be a statement for or against bonding, just to say it's ok if you decide that's what you want to do.